Questions tagged [inverse-kinematics]

For questions about using IK in rigging. Inverse Kinematics is the opposite of the default Forward Kinematics. Instead of posing each bone in a chain from the base to the tip, IK solves the rotations of preceding bone(s) in the chain automatically based on the position of the IK-constrained bone.

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61 views

Bone snapping to control bone while making an Inverse Kinematic Rig

Good evening. I have made a humanoid rig and wish to add an IK Controller to the bone "UpperArm.R". I wish to make the bone "CTRL_1.R" bone as a controller bone. Whenever I do so, ...
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136 views

armature relation off center

I have parented a grease pencil drawing to a bone and when I try rotating the bone they don't rotate around the same path. What am I missing? This has worked for me once but then it never worked again ...
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Inverse Kinematics Issue

I am fairly new at using Blender and I am currently trying to learn how to rig my modeled guy I downloaded off the internet. I was able to rig my guy's leg and is moving smoothly, but when I tried to ...
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25 views

How To: 1 Bone Moves Entire Arm, While IK Bones Can Bend Arm

I am trying to make a very simple character who has two IK bones in his arm (Besides Target and Pole) to move and bend it. At the moment I am to move his arm, bending it "realistically". However, I ...
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76 views

How can I make an object's tip position exactly where the IK controller bone is?

So I have this robot leg I made. This is the current setup I have The selected bone is the IK controller bone. When I tried to move the IK bone to the 3D cursor in edit mode I get this. So as a work ...
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Is there a way to make inverse kinematics target anywhere on a path or surface instead of just a point?

I'm trying to make an animation of someone playing the piano (as automatically as possible using the MIDI). It would be nice if I could make them hit somewhere on the key instead of having to specify ...
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235 views

Can you rotate bones within an IK Chain and allow the IK Target bone to move along with it?

I have a robot arm rigged with an IK and down the chain of the IK there is a joint specifically for rotating on the bone's Y Axis that allows the entire lower arm to rotate. However once I move the ...
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310 views

How to Avoid/Correct Circular Dependencies on IK Rigs with Drivers?

In reference to this report on mis-behaving IK rigs-- https://developer.blender.org/T76158 The answer is, IK rigs with dependency cycles have undefined (glitchy) behavior. My follow up questions are: ...
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135 views

newbie question: Move several bones with one control

So i have a humanoid rig and i want it to only do one thing - open and close arms as if hugging someone. I want to have a single control (with one degree of freedom) that moves all the bones ...
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How to make IK target bone undetachable?

So I have a arm, and a IK. The target bone of the IK is called wrist. My goal is to make the wrist bone undetachable from the IK bone. This is what I don't want. The wrist bone (purple one, is ...
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51 views

Character model going crazy after parenting

For this first post, I wand to detail a weird issue for my character model. I am new to IK rigs, and I just finished my character. The armature has absolutely no problem. After having parented the ...
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194 views

Bone rigging incorrectly

I am making a rigged character. When the wrist is lifted up, the whole arm should move, and the torso should not. The correct 'connecting line' from the wrist to the collarbone (may be hard to see, ...
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The rig rotates automatically when the desired pole target is set in Inverse kinematics

I was rigging my character seeing the tutorial by CG Geek https://youtu.be/SBYb1YmaOMY?t=450. The same process was done but my rig rotates out of model
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Pole target drags behind IK

I'm learning how to rig and one of the problems I have is trying to have the pole target bone move with the leg to keep the direction it's pointing at the same. I know I could parent the pole to the ...
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274 views

How to mimic IK to move a bone using Python without actually setting up IK?

Using Python in the script editor, I am currently moving my skeleton using motion capture data. For times when the data jumps to an inaccurate place or when there are gaps in the data, I want to use ...
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76 views

Is it possible to combine spline IK for the body and regular IK for limbs?

I've got a centipede model with an IK rig. I would like the spine to move along the spline curve in the background, following its curvature, while still letting me pose the legs like normal to make ...
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2answers
128 views

Sequenced Bone Movement with IK

yet another IK question.... I'm working on an animation project where I have an accordion wall segment that needs to extend outwards, one fold at a time. When I create the the IK bone setup and pull ...
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126 views

My IK rig won't flip properly

i'm having problems with my IK rig. I'm working on a generic character model rig with multiple animations. One of these animations is a walk cycle and a practice that a lot of people implement is the ...
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370 views

Force IK rig to bend knee "Wrong" way?

I've designed this mech's legs so they can fold up when crouched but that left the knee pivot behind the top one so my IK rig bends my leg the wrong way. Can I have my knee behind the "pelvis" and ...
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Animating tentacles

I'm doing some tests for a character for a videogame I'm making. The body is straight from MakeHumans, I imported it with the rig because it would save me the pain of rigging the character myself (...
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1answer
43 views

IK Legs Mess Up in Render

I have created an animation with this robot, and everything looks fine and normal in the viewport, but once I render it out in any render engine it does this weird thing that you see in the first ...
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30 views

Mesh partially wrinkling when armature moves

I'm new to Blender and am having an issue with some joints wrinkling when moving the armature. In the attached image the left knee is exhibiting this problem, while the right knee is bending as I want ...
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1answer
63 views

IK Flexible Bones Twisting Mesh

I created a tentacle, added an armature, changed the bones to b bones, added ik, target null object and noticed that the bones looked twisted (without me doing anything). Once I started posing my ...
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1answer
42 views

Targeted bones don't move with the rest of the armature

IK bones don't move with the rest of the armature Ask Question Asked today Viewed 9 times 0 Whenever I move the main controller bone of the mesh, most of the armature moves except for the bones the ...
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I rigged a human model with Inversed Kinematics but it is not working. How can I debug this?

I'm having a hard time understanding how to debug my rig not working. I created the human model and now I am trying to rig the right leg. How could share more information about this? I would like my ...
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I made an IK foot bone and it moves the entire body while bending the foot. Anyone have any idea's why this is happening?

Here's the file if anyone needs it so they can help figure out the problem, thanks.
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Does anyone know why my bone name won't show up in the bone tab for the target when doing constraints?

I'm trying to make an IK bone, but it won't show up in the constraints tab, I press the target and go to the armature, then I press the bone tab and the name won't show up, does that for the rest of ...
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41 views

Keyframe non IK bones

I've created a somewhat working IK rig for a video game character that I would want to animate for use in the game through modding. My issue is that when I move my IK bones and set a key frame for ...
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200 views

How to scale along a spline Ik rig

I was curious if it was possible to scale this along the spline of a spline IK rig almost like it was growing along the spline. Below is how it scales now but I do not want it to look like this I ...
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433 views

Exporting IK bones from blender2.8 to unity has problem

I'm working blender2.8 with unity3d but when I export my model from blender to unity My Bone plays animation so weird see this First picture in on unity. second one is on blender2.8 Two legs have ...
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2k views

How to export animated character from Blender 2.8 as fbx to Unity?

I have a fully rigged and animated character with shape keys. I created it in 2.79, exported it using ASCII with the settings below and could use it in Unity without any problems. However, after ...
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2answers
45 views

Parenting armature to mesh with automatic weights

I'm just beginning in the animation world and I've been studying Blender – so far it's been good but now I've got a snag. Whenever I parent my mesh to a certain armature or bone on the right side of ...
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121 views

3-bone IK chain not rotating properly, why?

I ran into a weird bug where my 3-bone IK chain isn't behaving as expected. I've made other quadrupeds in the past and had no problem like this. As far as I can tell, the IK constraint is also exactly ...
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2answers
129 views

inverse kinematic animation alignement of mouvement issue

I have rigged this elephant mesh with inverse kinematic but when I move the leg with the controler bone, the leg bend inward (my goal is to have a leg that bend along the Y axis). Here are picture to ...
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139 views

Deform bone will not follow IK bone perfectly with copy rotation

I am trying to separate bone layers with ik fk central and deform layers. I am having problem with copy rotation from IK>central>def bones (each in different layers.) The deform bone will not follow ...
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132 views

How to rig a plate so that it points to a target, with off-centre tilt, and constraints on elongation and tilt

a question from someone who has never done rigging before. I need to make a plate (in my example: a cylinder) follow a target (a empty). But with some constraints: There are three degrees of freedom:...
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920 views

How to use root motion with inverse kinematics?

I have created a simple attack animation using inverse kinematics to animate the arms and legs of a character. Now, I want the animation to use root motion to export it to Unreal Engine 4. I have ...
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1k views

Bone constraint rotation not working correctly

I am following a skeleton rig tutorial on youtube step by step and despite having the exact same setup, my armature behaves incorrectly. https://youtu.be/jp_SqjB0468?t=920 at minute 15:40. This is the ...
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56 views

How to Rig This

I have this Bone Rig that I don't know how to rig. Think of it like a dog ear. Here's a picture. I'm trying to figure out how to rig it so that the bones on the right side are the control bones. ...
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40 views

Finger Isn't Flexing

OK, I am new to rigging, so hopefully this is an easy question to answer. I've got a finger rig, which I made by following a book, to be specific, the Second Edition of Oliver Villar's book, Learning ...
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52 views

Wacky IK arm Movement

I have an arm rig shown below. C stands for control, and D stands for deform. I'm having a problem where when I try to move C_Hand in order to move the forearm, it does move, but it spins around ...
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77 views

Which algorithm does Blender use for Inverse Kinematics?

Is there any documentation how the Inverse Kinematics Bone Constraint is implemented? I assume the problem is written in some kind of minimizing problem and ...
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1answer
192 views

Heel bone twists strangely under rotation, need to resolve in order to progress

I have about 13 animations already made for an armature and now I am getting a very alarming, unexpected result that I need help identifying the cause of and fixing: When I try to rotate the entire ...
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1answer
183 views

Hand is not glued to gun as expected

I have a character mesh with a 2 handed gun held in his right arm and supported by left arm. IK and constraints are set properly as suggested here: Rigging two handed weapon Still, it seems like the ...
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2k views

Automatic Forearm twist?

I'm trying to setup a rig that allows IK/FK (via influence property), where the forearm twist joint automatically alleviates part of the twist of the hand. Not necessarily as part of the IK - just ...
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545 views

Converting FK animations to IK

I have already created a few animations (idle, run...) for a character that I rigged using FK, because I didn't know about IK at the time (I'm very new to animation). However I recently learnt about ...
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210 views

What Inverse kinematics technique does the legacy IK solver use?

There are different IK techniques like FABRIK, CCD, Jacobian inverse technique etc. Does anybody know which one Blender's legacy solver uses?
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136 views

How to make ik target overlap with its constrained bone's location

I know that the general practice when creating an ik rig for say a leg, you constrain lower leg bone to ik target and create a copy rotation constraint from the ik target to the foot. Now I would ...
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2answers
248 views

I can't understand Inverse Kinematics

So I am relatively new to Blender, and while figuring out the process that is rigging, and applying Inverse Kinematics to my armature, I came into contact with a weird problem, Normally, inverse ...
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153 views

Using Inverse Kinematics and/or Pole Targets to move hair bones in unison?

I have a model whose hair is composed of several strands that I have each connected to a bone as part of the whole armature. What I want is for each "hair bone" to rotate at the tail in correspondence ...